Concrete block



FIG. 1 is a front perspective of a concrete block cast with a concave-convex decorative face;

FIG. 2 is a rear perspective of a concrete block cast with a concave-convex decorative face;

FIG. 3 is a front perspective of a concrete block with a cleaved decorative face bounded by concave cast portions; and,

FIG. 4 is a rear perspective of a concrete block with a cleaved decorative face bounded by concave cast portions. 

The ornamental design for a concrete block, as shown. 